.Menu li.l1.current {
border-bottom: none;
}

.Menu a.l1.current {
  background: #66CC00 url(http://www.greenpeace.org/resources/gcms/assets/graphics/navigation-arrow.png) 5px 5px no-repeat; 
  font-weight: bold;
  text-transform: uppercase;
  padding: 4px 4px 4px 24px;  
  color: #ffffff;
}